@misc{indiciae873823e02746,
  title = {Reconnaissance geologic map of the Covelo 30- by 60-minute Quadrangle, Northern California},
  author = {A. S. Jayko and M.C. Blake and R. J. McLaughlin and H.N. Ohlin and S. D. Ellen and H.M. Kelsey},
  year = {1989},
  doi = {10.3133/mf2001},
  url = {https://pubs.usgs.gov/publication/mf2001},
  note = {Source identifier: mf2001}
}